1 /* 2 * Copyright (c) 2016 Tom Haynes <loghyr@primarydata.com> 3 * 4 * The following implements a super-simple flex-file server 5 * where the NFSv4.1 mds is also the ds. And the storage is 6 * the same. I.e., writing to the mds via a NFSv4.1 WRITE 7 * goes to the same location as the NFSv3 WRITE. 8 */ 9 #include <linux/slab.h> 10 11 #include <linux/nfsd/debug.h> 12 13 #include <linux/sunrpc/addr.h> 14 15 #include "flexfilelayoutxdr.h" 16 #include "pnfs.h" 17 18 #define NFSDDBG_FACILITY NFSDDBG_PNFS 19 20 static __be32 21 nfsd4_ff_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, 22 struct nfsd4_layoutget *args) 23 { 24 struct nfsd4_layout_seg *seg = &args->lg_seg; 25 u32 device_generation = 0; 26 int error; 27 uid_t u; 28 29 struct pnfs_ff_layout *fl; 30 31 /* 32 * The super simple flex file server has 1 mirror, 1 data server, 33 * and 1 file handle. So instead of 4 allocs, do 1 for now. 34 * Zero it out for the stateid - don't want junk in there! 35 */ 36 error = -ENOMEM; 37 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 38 if (!fl) 39 goto out_error; 40 args->lg_content = fl; 41 42 /* 43 * Avoid layout commit, try to force the I/O to the DS, 44 * and for fun, cause all IOMODE_RW layout segments to 45 * effectively be WRITE only. 46 */ 47 fl->flags = FF_FLAGS_NO_LAYOUTCOMMIT | FF_FLAGS_NO_IO_THRU_MDS | 48 FF_FLAGS_NO_READ_IO; 49 50 /* Do not allow a IOMODE_READ segment to have write pemissions */ 51 if (seg->iomode == IOMODE_READ) { 52 u = from_kuid(&init_user_ns, inode->i_uid) + 1; 53 fl->uid = make_kuid(&init_user_ns, u); 54 } else 55 fl->uid = inode->i_uid; 56 fl->gid = inode->i_gid; 57 58 error = nfsd4_set_deviceid(&fl->deviceid, fhp, device_generation); 59 if (error) 60 goto out_error; 61 62 fl->fh.size = fhp->fh_handle.fh_size; 63 memcpy(fl->fh.data, &fhp->fh_handle.fh_base, fl->fh.size); 64 65 /* Give whole file layout segments */ 66 seg->offset = 0; 67 seg->length = NFS4_MAX_UINT64; 68 69 dprintk("GET: 0x%llx:0x%llx %d\n", seg->offset, seg->length, 70 seg->iomode); 71 return 0; 72 73 out_error: 74 seg->length = 0; 75 return nfserrno(error); 76 } 77 78 static __be32 79 nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp, 80 struct nfs4_client *clp, struct nfsd4_getdeviceinfo *gdp) 81 { 82 struct pnfs_ff_device_addr *da; 83 84 u16 port; 85 char addr[INET6_ADDRSTRLEN]; 86 87 da = kzalloc(sizeof(struct pnfs_ff_device_addr), GFP_KERNEL); 88 if (!da) 89 return nfserrno(-ENOMEM); 90 91 gdp->gd_device = da; 92 93 da->version = 3; 94 da->minor_version = 0; 95 96 da->rsize = svc_max_payload(rqstp); 97 da->wsize = da->rsize; 98 99 rpc_ntop((struct sockaddr *)&rqstp->rq_daddr, 100 addr, INET6_ADDRSTRLEN); 101 if (rqstp->rq_daddr.ss_family == AF_INET) { 102 struct sockaddr_in *sin; 103 104 sin = (struct sockaddr_in *)&rqstp->rq_daddr; 105 port = ntohs(sin->sin_port); 106 snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp"); 107 da->netaddr.netid_len = 3; 108 } else { 109 struct sockaddr_in6 *sin6; 110 111 sin6 = (struct sockaddr_in6 *)&rqstp->rq_daddr; 112 port = ntohs(sin6->sin6_port); 113 snprintf(da->netaddr.netid, FF_NETID_LEN + 1, "tcp6"); 114 da->netaddr.netid_len = 4; 115 } 116 117 da->netaddr.addr_len = 118 snprintf(da->netaddr.addr, FF_ADDR_LEN + 1, 119 "%s.%hhu.%hhu", addr, port >> 8, port & 0xff); 120 121 da->tightly_coupled = false; 122 123 return 0; 124 } 125 126 const struct nfsd4_layout_ops ff_layout_ops = { 127 .notify_types = 128 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 129 .disable_recalls = true, 130 .proc_getdeviceinfo = nfsd4_ff_proc_getdeviceinfo, 131 .encode_getdeviceinfo = nfsd4_ff_encode_getdeviceinfo, 132 .proc_layoutget = nfsd4_ff_proc_layoutget, 133 .encode_layoutget = nfsd4_ff_encode_layoutget, 134 }; 135